Say goodbye to .msix and .msixbundle files in your email (unless your admin whitelists them).
New Outlook for Windows and Outlook on the web will block .msix app package attachments by default from November.
Morning Overview on MSN
Outlook on the web and the new Outlook will start blocking MSIX attachments next month after attackers abused them
Microsoft is adding .msix and .msixbundle files to the blocked attachment list in Outlook on the web and the new Outlook for Windows, with the Exchange Online rollout starting in early November 2026 ...
Microsoft announced that it will add .msix and .msixbundle attachments to the list of blocked attachments in Outlook Web and the new Outlook Windows client starting next month.
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